Cut-off valve



(No Model.)

.M.- N. OUMMISKBY.

GUT-OFF VALVE.

Patented Jan. 9.1 883.

N. PETERS. FhnlaLflhogrlphar. WaIhZngtun. D. c.

llwirn STATES FFIQEe MICHAEL N. GUMHISKEY, 0F PATERSON, NEW JERSEY.

CUT-OFF VALVE.

SPECIFICATION forming part of Letters Patent No. 270,396, dated January9, 1883.

Application filed June 12. 1852. (No model.)

To all whom it may concern:

Be it known that I, MICHAEL N. UUMMis- KEY, of Paterson, in the countyof Passaic and State of New Jersey, have invented an Improvement inCut-01f Valvesfor Steam-Engines, of which the following is aspecification. My present invention is an improvement upon ormodification of that for which I made application for a patent February13, 1882.

In my present invention the balanced valves are operated by inclinesupon the rod that is moved by the eccentric. These valves admit steam tothe ordinary steam-valve, and there is a rocking lever between theeccentric-rod and the valve-rod, the same having slots with shoulders ofpeculiar construction, that give motion to the valve at the time theeccentric-.

rod is approaching the terminals of its reciprocation.

In-the drawings, Figure 1 is a longitudinal section of the steam-chestand valves. Fig. 2 is a transverse section, and Fig. 8 represents therocker-lever with the eccentric-rod in section.

The steam-ports a I) lead to the cylinder of the engine. The port I) isthe exhaust. The valve 0 is adapted to these ports, and it is operatedby the. valve-rod d and rocker-lever f, hereinafter described.

Above the vaivecthere isa compoundsteamchest, the exterior casing, 9,having a pipe, 9, through which steam. passes into such case, and thereis an arch, h, over the valve 0, and a chamber above it, formed by acurved pipe, k, opening at the ends through the arch h, and there arevalve-seats l l in the pipe for the balanced valves 2' i. These valvesare nearly the same size, the upper valve-seat and valve beingsufficiently large for the lower valve to pass through the uppervalve-seat as it is placed in position.

When the valvesz' i are raised off their seats the steam passes downthrough the valve-seat l and up through the valve-seat l, and by thecurved passage through the pipe kto the chamber below the arch h, inwhich is the valve 0.

The rod m receives its motion from an eccentric in any usual manner, andto it is connected the valve-lifter a in the form of a rod, passingthrough a gland ato and flattened whereit goes through a mortise in thespindle 2' that connects the valves ii. There areguideways at r,

in which the valve-liftern slides and by which it is supported, andthere is a roller, 8, in the spindle to lessen friction. Thevalve-lifter has a cam-face in its upper edge, the same be ing composedof two inclines, at and 5, that operate near the ends of the movement ofthe eccentricrod.

The balanced valves are lifted by the incline at when the eccentric-rodisnearing the extreme movement to the left, and upon the eccentric-rodmoving to the right the balanced valves are allowed to close and cut offthe steam, the valve 0 is moved at the proper time to reverse theconnections of the exhaust and steam-ports dining the time that there isbut little pressure on the valve, and then the balanced valves t' t" areraised again as the eccentric-rod approaches the termination of itsstroke to the right, the incline 5 acting upon the roller 8 andvalve-stem to lift the valves H, and these are again lowered and closedshortly after the eccentric-rod has commenced I its movement again tothe left.

In order to prevent any concussion of the valves i 2" upon theirseats asthey drop, I provide a stem, with a plunger, t, and a short cylinder ata, into which the plunger t passes. The steam and any water'ofcondensation confined in this cylinder a form acushion to check thedescent of the valves, and it is necessary to make holes through theplunger or its cylinder, or to make the plunger fit sufficiently looselyinto thecylinder to prevent the confined cushion holding the valve up.

I will now describe the peculiar device for connecting the eccentric-rodto the valve-rod d. The leverf may be in two parts, with theeccentric-rod on passing through it; but I prefer and have shown theeccentric-rod in two parts, with the tumbler-lever between them.

In this tubular lever there are two slots hav ing shoulders 5 6 7 8, andthere are studs or pins passing through the eccentric-rod, as at p p,and these are preferably surrounded by rollers. As the eccentric-rodmoves from right to left the studs 19 12 do not act upon thetumbler-lever until they come against the shoulders 6 and S, and bycontact with them the lever], the valve-rod (l, and the valve 0 aremoved so as to open the port I) to the steam and the port a to theexhaust. The studs pp now move along the remainder of the lengthaforesaid.

of the slots without acting on the valve 0, and during this time thevalves 6 i are raised, as ()n the return movement of the eccentric-rodto the right the studs move along in their slots until they reach theshoulders 5 and 7, when they again give motion to the leverf and valveand return it to the position shown by full lines. Thislever, havingslots with shoulders and the studs acting thereon, may be employed inother instances where a gradual reciprocating motion is employed to givea sudden movement, and then to allow a pause until an opposite movementis given on the return-stroke.

In an application bearing like date herewith I have shown a valve withvalve-rod, eccentricrod, and rockinglever, having S- sha-ped slotsadapted to moving the valve to admit steam, and then to cut off thesteam so that the engine operates expansively. This does not form anypart of this particular application, as in the present easel constructthe parts in such a manner as to move the valve and allow it to remainfully open while the eccentric-rod continues to move to the end of itsstroke and partially returns.

I claim as my invention 1. The combination, with the valves *6 t" andtheir respective seats, of the valve-lifter n, having the inclines 4 andand sliding endwiseacross the stem of the said valves '1 1",substantially as set forth.

2. The combination, with the valve 0 and means for actuating the same,of the valves i i, their seats, the steam-passages, and the valvelii'tern, actuated by the eccentric-rod, and having the inclines 4 and 5 andthe roller 8 upon the valve-stem, substantially as set forth.

3. The combination, with the valve and valve-rod, of the eccentric-rod,the tumbler-1e ver between the valve-rod and the eccentricrod, andprovided. with the slots and shoulders, and the studs upon theeccentric-rod, substantially asset forth, whereby the valve is openedand allowed to remain open while the eccentric-rod completes its strokeand pan tially returns, as specified.

4. The combination, with the valves i i, the valve-chest,steam-passages, and the valve 0, of the valve-lifter n, eccentric-rod,slotted rockerlever, valve-rotLand studs passing through the slots,substantially as set forth.

5. In combination with a pend ulous lever and a rod actuated by thesame, an eccentric-rod, and studs passing into slots with shoulders,substantially as specified, whereby the pendulous lever is moved by theeecentric rod in the middle portions of its strokes, substantially asspecified.

Signed by me this 2d day of June, A..l). 1882.

M. N. CILTMMISKEY. \Vitnesses:

Geo. '1. PINOKNEY, CHAS. H. SMITH.

